CN107892385B - Reinforced culture method for partial nitrosation granular sludge at low temperature - Google Patents
Reinforced culture method for partial nitrosation granular sludge at low temperature Download PDFInfo
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- CN107892385B CN107892385B CN201711171165.5A CN201711171165A CN107892385B CN 107892385 B CN107892385 B CN 107892385B CN 201711171165 A CN201711171165 A CN 201711171165A CN 107892385 B CN107892385 B CN 107892385B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a method for culturing partially nitrosated granular sludge at low temperature in an enhanced manner, which comprises the following steps: inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor; acclimatizing and culturing aerobic granular sludge in an SBR reactor at 25-30 ℃; after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at the temperature of 30-35 ℃; after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation; and gradually reducing the temperature of the SBR reactor to 10-15 ℃ at the speed of 0.1-0.5 ℃/d, and adding fly ash for continuous culture to obtain the activity-enhanced partial nitrosation granular sludge.
Description
Technical Field
The invention belongs to the technical field of biological wastewater treatment, and particularly relates to a method for culturing partially nitrosated granular sludge at a low temperature in an enhanced manner.
Background
The existing urban sewage denitrification mainly depends on a nitrification-denitrification process, but the process mainly has the defect of high energy consumption. The nitrosation-anaerobic ammonia oxidation is a novel autotrophic nitrogen removal process developed in recent years, has the characteristic of low energy consumption, and NH4 +N is an electron donor, NO2 --N is an electron acceptor, converting it to N2. However, anaerobic ammonia oxidation requires NO in the feed water2 --N/NH4 +the-N ratio is 1.32: 1, and strict water feeding conditions become a technical bottleneck limiting the process development.
By partial nitrosation, NH can be generated4 +And (4) removing part of the N to obtain effluent, so that the effluent proportion meets the water inlet requirement of anaerobic ammonia oxidation. The consumption of oxygen is greatly reduced. However, partial nitrosation is used as a premise and a foundation, and the problems of difficult sludge retention and growth, impact resistance, poor load capacity, easy instability after long-term operation, turning to full-process nitrification and the like exist in practical research. In addition, because the temperature in winter in the north is low, the nitrosation-anaerobic ammonia oxidation technology needs to be carried out at medium and high temperature, and a large amount of energy is consumed for maintaining the medium and high temperature, the maintenance of the activity of part of nitrosation granular sludge is particularly important under the low temperature condition.
The fly ash exists in the form of aluminium-rich glass body, and is a loose solid aggregate containing oxides (mainly SiO) of elements of silicon, aluminium, iron, calcium and magnesium2And Al2O3In addition, Fe2O3CaO, MgO, etc.) and some trace elements and rare elements, and has strong physical adsorption and chemical adsorption properties. Based on these characteristics of fly ash, the present applicationThe method is characterized in that the fly ash is used as an initial inner core of initial self-aggregation for the first time, bacteria can be adhered, attached and grown on the surface of the fly ash, and initial small particles are formed on the basis of the bacteria; the outer zoogloea of the small particles falls off under the impact of air flow, water flow, mutual collision among the particles and the like and then becomes a precursor of new particles again, and the process is repeated. Meanwhile, due to the addition of the fly ash, more frequent collision and friction between sludge zoogloea and particles or zoogloea per se occur in a narrow space, so that the mutual aggregation of sludge and the formation of granular sludge are delayed; but frequent collision and friction also enhance the hydraulic selective pressure required by the formation of the granular sludge, thereby promoting the stability of the granular sludge structure and having better strengthening effect on the nitrosation granular sludge.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for culturing nitrosation granular sludge under low temperature in an enhanced manner, which can effectively enhance the activity and stability of the nitrosation granular sludge. The technical scheme of the invention is as follows:
a method for culturing partially nitrosated granular sludge under low temperature in an enhanced manner comprises the following steps:
(1) inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor;
(2) acclimatizing and culturing aerobic granular sludge in an SBR reactor at 25-30 ℃;
(3) after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at the temperature of 30-35 ℃;
(4) after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation;
(5) and gradually reducing the temperature of the SBR reactor to 10-15 ℃ at the speed of 0.1-0.5 ℃/d, and adding fly ash for continuous culture to obtain the activity-enhanced partial nitrosation granular sludge.
Further, the specific control of the acclimatization and culture of the aerobic granular sludge in the step (2)The preparation conditions are as follows: the aeration rate of the SBR is 40-160L/min, the aeration time is 360-450 min, the water inlet time is 5-10 min, the hydraulic retention time is 6-12 h, the precipitation time is 5-10 min, the water outlet time is 5-10 min, and the standing time is 10-35 min; the pH of the inlet water of the SBR reactor is 7.0-7.2, the COD of the inlet water is 500-800 mg/l, the ammonia nitrogen concentration of the inlet water is 80-150 mg/l, and the Ca of the inlet water2+The concentration is 100-200 mg/l, and the aerobic granular sludge is obtained after acclimatization and culture for 38-45 days.
Further, the specific control conditions for culturing the nitrosation granular sludge in the step (3) are as follows: increasing the pH of the inlet water of the SBR reactor to 7.3-7.6, reducing the COD of the inlet water to 200-400 mg/l, increasing the ammonia nitrogen concentration of the inlet water to 400-600 mg/l, and culturing for 15-20 d to obtain the nitrosation granular sludge.
Further, the hydraulic retention time of the system in the step (4) is adjusted to be 1-5 h.
Further, the concrete control conditions for adding the fly ash to continue the culture in the step (5) are as follows: the addition amount of the fly ash is 80-120 mg/L, and the culture time is 60-90 d.
Further, the particle size of the activity-enhanced nitrosation granular sludge is 0.7-2.1 mm, the sedimentation speed is 0.3-0.6 cm/s, the ammonia nitrogen removal rate of effluent is 65-70%, the nitrite nitrogen accumulation rate is 65-70%, and NO is2 --N/NH4 +N is (1.2 +/-0.1) to 1.
Compared with the prior art, the invention has the characteristics and beneficial effects that: according to the invention, the fly ash is used as an initial core of initial self-aggregation, bacteria can be adhered, attached and grown on the surface of the fly ash under a low-temperature condition, and initial small particles are formed on the basis of the initial small particles, and frequent collision is generated between fly ash particles and partial nitrosation granular sludge, so that the stability of the granular sludge structure is promoted, and the partial nitrosation granular sludge is reaggregated. In addition, the invention can make part of nitrosation granular sludge adapt to environmental change gradually through the gradual cooling process, and ensure that the activity of the nitrosation granular sludge is not influenced in the whole culture process.
Drawings
Fig. 1 is a schematic structural diagram of a Sequencing Batch Reactor (SBR) adopted in the implementation of the invention, wherein 1-an aeration pipe, 2-a water bath circulation layer, 3-a water bath water outlet pipe, 4-a mixed liquid water taking pipe, 5-an aeration head, 6-a water bath water inlet pipe, 7-a water inlet pipe and 8-a water outlet pipe.
Detailed Description
The flocculent sludge adopted by the implementation of the invention is the return sludge of the secondary sedimentation tank, and the MLSS is 3300 mg/L.
The SBR reactor adopted in the implementation of the invention is shown in figure 1, the bottom end of the SBR reactor is provided with an aeration head, and the water discharge rate is 70 percent.
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
Example 1
The embodiment provides a method for culturing partially nitrosated granular sludge at low temperature in an enhanced manner, which comprises the following steps:
(1) inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor;
(2) acclimatizing and culturing aerobic granular sludge in an SBR reactor at 28 ℃, and specifically controlling the conditions as follows: the aeration rate of the SBR reactor is 120L/min, the aeration time is 420min, the water inlet time is 5min, the hydraulic retention time is 8h, the precipitation time is 10min, the water outlet time is 5min, and the standing time is 20 min; the pH of the inlet water of the SBR reactor is 7.2, the COD of the inlet water is 700mg/l, the ammonia nitrogen concentration of the inlet water is 90mg/l, and the Ca of the inlet water2+The concentration is 200mg/l, and the aerobic granular sludge is obtained after domestication and culture for 45 days;
(3) after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at 33 ℃, wherein the specific control conditions are as follows: increasing the pH of the inlet water of the SBR reactor to 7.5, reducing the COD of the inlet water to 260mg/l, increasing the ammonia nitrogen concentration of the inlet water to 420mg/l, and culturing for 20d to obtain nitrosation granular sludge;
(4) after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to be 4 hours to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation;
(5) and gradually reducing the temperature of the SBR reactor to 15 ℃ at the speed of 0.2 ℃/d, adding fly ash for continuous culture, wherein the adding amount of the fly ash is 80mg/L, and the culture time is 70d, so as to obtain the partially nitrosation granular sludge with enhanced activity.
The particle size of the activity-enhanced nitrosation granular sludge obtained in the embodiment is 0.7mm, the sedimentation speed is 0.4cm/s, the ammonia nitrogen removal rate of effluent is 65%, the nitrite nitrogen accumulation rate is 65%, and NO is2 --N/NH4 +N is 1.2: 1.
Example 2
The embodiment provides a method for culturing partially nitrosated granular sludge at low temperature in an enhanced manner, which comprises the following steps:
(1) inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor;
(2) acclimatizing and culturing aerobic granular sludge in an SBR reactor at 28 ℃, and specifically controlling the conditions as follows: the aeration rate of the SBR reactor is 160L/min, the aeration time is 400min, the water inlet time is 7min, the hydraulic retention time is 10h, the precipitation time is 10min, the water outlet time is 5min, and the standing time is 30 min; the pH of the inlet water of the SBR reactor is 7.1, the COD of the inlet water is 600mg/l, the ammonia nitrogen concentration of the inlet water is 100mg/l, and the Ca of the inlet water2+The concentration is 150mg/l, and the aerobic granular sludge is obtained after domestication and culture for 44 days;
(3) after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at 33 ℃, wherein the specific control conditions are as follows: increasing the pH of the inlet water of the SBR reactor to 7.5, reducing the COD of the inlet water to 300mg/l, increasing the ammonia nitrogen concentration of the inlet water to 450mg/l, and culturing for 18d to obtain nitrosation granular sludge;
(4) after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to be 4 hours to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation;
(5) and gradually reducing the temperature of the SBR reactor to 10 ℃ at the speed of 0.3 ℃/d, adding fly ash for continuous culture, wherein the adding amount of the fly ash is 100mg/L, and the culture time is 72d, so as to obtain the partially nitrosation granular sludge with enhanced activity.
The particle size of the activity-enhanced nitrosation granular sludge obtained in the embodiment is 0.8mm, the sedimentation speed is 0.4cm/s, the ammonia nitrogen removal rate of effluent is 70%, the nitrite nitrogen accumulation rate is 65%, and NO is2 --N/NH4 +N is 1.2: 1.
Example 3
The embodiment provides a method for culturing partially nitrosated granular sludge at low temperature in an enhanced manner, which comprises the following steps:
(1) inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor;
(2) acclimatizing and culturing aerobic granular sludge in an SBR reactor at 28 ℃, and specifically controlling the conditions as follows: the aeration rate of the SBR reactor is 80L/min, the aeration time is 450min, the water inlet time is 10min, the hydraulic retention time is 12h, the precipitation time is 10min, the water outlet time is 10min, and the standing time is 35 min; the pH of the inlet water of the SBR reactor is 7.2, the COD of the inlet water is 500mg/l, the ammonia nitrogen concentration of the inlet water is 110mg/1, and the Ca of the inlet water2+The concentration is 200mg/1, and the aerobic granular sludge is obtained after domestication and culture for 40 days;
(3) after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at 33 ℃, wherein the specific control conditions are as follows: increasing the pH of the inlet water of the SBR reactor to 7.6, reducing the COD of the inlet water to 400mg/1, increasing the ammonia nitrogen concentration of the inlet water to 600mg/l, and culturing for 20d to obtain nitrosation granular sludge;
(4) after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to be 3h to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation;
(5) gradually reducing the temperature of the SBR reactor to 10 ℃ at the speed of 0.5 ℃/d, adding fly ash for continuous culture, wherein the adding amount of the fly ash is 110mg/L, and the culture time is 80d, so as to obtain the partially nitrosation granular sludge with enhanced activity.
The particle size of the activity-enhanced nitrosation granular sludge obtained in the embodiment is 2.0mm, the sedimentation speed is 0.5cm/s, the ammonia nitrogen removal rate of effluent is 66%, and the accumulation rate of nitrosation nitrogen is 68%，NO2 --N/NH4 +N is 1.2: 1.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A method for culturing partially nitrosated granular sludge under low temperature in an enhanced manner is characterized by comprising the following steps:
(1) inoculating floccule sludge of a secondary sedimentation tank in a Sequencing Batch Reactor (SBR) reactor, wherein the volume of the inoculated floccule sludge accounts for 25 percent of the total volume of the reactor;
(2) acclimatizing and culturing aerobic granular sludge in an SBR reactor at 25-30 ℃;
(3) after the aerobic granular sludge is cultured, culturing nitrosation granular sludge in an SBR reactor at the temperature of 30-35 ℃;
(4) after the nitrosation granular sludge is cultured, adjusting the hydraulic retention time of the system to form part of nitrosation granular sludge, so that the effluent quality meets the water inlet requirement of anaerobic ammonia oxidation;
(5) gradually reducing the temperature of the SBR reactor to 10-15 ℃ at the speed of 0.1-0.5 ℃/d, and adding fly ash for continuous culture to obtain partially nitrosation granular sludge with enhanced activity; wherein the addition amount of the fly ash is 80-120 mg/L, and the culture time is 60-90 days.
2. The method for intensively culturing the partially nitrosated granular sludge at the low temperature according to claim 1, wherein the specific control conditions for acclimatizing and culturing the aerobic granular sludge in the step (2) are as follows: the aeration rate of the SBR is 40-160L/min, the aeration time is 360-450 min, the water inlet time is 5-10 min, the hydraulic retention time is 6-12 h, the precipitation time is 5-10 min, the water outlet time is 5-10 min, and the standing time is 10-35 min; the pH of the inlet water of the SBR reactor is 7.0-7.2, the COD of the inlet water is 500-800 mg/l, and the ammonia nitrogen concentration of the inlet water is80-150 mg/l of Ca in water2+The concentration is 100-200 mg/l, and the aerobic granular sludge is obtained after acclimatization and culture for 38-45 days.
3. The method for culturing the partially nitrosated granular sludge at the low temperature according to claim 1, wherein the specific control conditions for culturing the nitrosated granular sludge in the step (3) are as follows: increasing the pH of the inlet water of the SBR reactor to 7.3-7.6, reducing the COD of the inlet water to 200-400 mg/l, increasing the ammonia nitrogen concentration of the inlet water to 400-600 mg/l, and culturing for 15-20 d to obtain the nitrosation granular sludge.
4. The method for culturing the partially nitrosated granular sludge under the low temperature according to claim 1, wherein the hydraulic retention time of the system in step (4) is adjusted to 1-5 h.
5. The method for culturing the partially nitrified granular sludge at the low temperature in an enhanced manner according to claim 1, wherein the particle size of the partially nitrified granular sludge with the enhanced activity is 0.7-2.1 mm, the sedimentation rate is 0.3-0.6 cm/s, the ammonia nitrogen removal rate of effluent is 65-70%, the nitrite nitrogen accumulation rate is 65-70%, and NO is in a range of 65-70%2 --N/NH4 +N is (1.2 +/-0.1) to 1.
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| CN101531983A (en) * | 2009-04-17 | 2009-09-16 | 北京工业大学 | Method for cultivating aerobic short-cut nitrification granular sludge for treating domestic sewage |
| CN103708616A (en) * | 2014-01-02 | 2014-04-09 | 济南大学 | Method for culturing nitrosation granular sludge by matching with anaerobic ammonia oxidation |
| CN103922466A (en) * | 2014-03-29 | 2014-07-16 | 北京工业大学 | Culture method of granular nitrosation sludge for treating urban domestic sewage at normal temperature |
| JP2015229150A (en) * | 2014-06-06 | 2015-12-21 | 住友重機械工業株式会社 | Anaerobic treatment apparatus, anaerobic treatment method, and display device of anaerobic treatment apparatus |
| CN107235553A (en) * | 2017-07-25 | 2017-10-10 | 江南大学 | A kind of low-temperature aerobic granular sludge fast culture process based on sludge incineration ash |
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Patent Citations (6)
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| CN101054236A (en) * | 2007-05-28 | 2007-10-17 | 北京市环境保护科学研究院 | Denitrogenation method for nitrosation-anaerobic ammoxidation single stage organism |
| CN101531983A (en) * | 2009-04-17 | 2009-09-16 | 北京工业大学 | Method for cultivating aerobic short-cut nitrification granular sludge for treating domestic sewage |
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